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What settings do I have to have on my Oly 5050 to take advantage of the Tetra 5050 ROC/TTL functions? I was using "external" flash only to conserve battery power. After reading some posts it seems like you need the "internal + external" to be able to have the ROC work, or is it "slave" setting? I guess that if I have the setting to "external" only, I am using the Tetra as a manual setting, adjusting the output myself. Should the flash be in "slow 1"?

I also heard that the constant flash inside the housing makes it too warm. Can you set the flash at -0.7 EV or something to conserve power? How can you switch from manual to ROC quickly? I also heard that you should turn your infra red illuminator off.